An all girls sibset

My 3 main characters are an all girls sibset, the youngest 12 or 13, the middle 14 or 15 and the eldest no older than 16. Their last name is Teller, and the middle child is Samantha. Samantha is a clever girl, spunky but a little quiet. Her older sister is very similar and very intellectual, thoughtful. The youngest is optimistic and energetic. She always looks happy, even if she isn't that happy. I only need the oldest and youngest girls names, I've decided on Samantha for the middle girl.

“I read books when I was a kid, lots of books. Books always seemed like magic to me. They took you to the most amazing places. When I got older, I realized I couldn't find books that took me to all the places I wanted to go. To go to those places, I had to write some books myself.”
― Pat Murphy, The Wild Girls

"Like everyone else, I am going to die. But the words – the words live on..."
― J. Michael Straczynski